I use flooring underlay, but any sturdy plastic will do. An old shower liner? I've even found the underlay at the Goodwill store. It's a long shot, but an old liner would probably be easier to find. Depending on the size of your project some stores have heavier plastic bags. Do you have a Bed Bsth and .beyond nearby? They have big plastic bags in their gift wrap department -- free. It's a nice heavy plastic in purple! Or go to the hardware and look for rolls of plastic. Just make sure it's not too flimsy. Good luck. Let us know what you find.
I've used all sorts! Cardboard wrapped in plastic, foam underlay, packaging material, rubber roofing felt.... and Funky Foam is good for smaller projects. Oh yes, shelf liner (not the rubbery stuff - I use that for fulling!)
My favorite is foam sheets used to make cut outs but it is only good for small things comes in 81/2 x 11 sheets. I like it because it is thick enough for me to be able feel the edges of it when I am felting. I had some pond liner that I got rid of before I started felting. It would have made very good resists. The roofing material sounds good - building alot of houses around me will have check the jobsites for leftovers. I do like something thicker than plastic sheeting.
Thanks, all. I keep finding things that are all 8-1/2 x 11. I have Funky Foam, and some packaging material and I'm looking at my mouse pad right now :-), but nothing is as large as I'd like. I tried the cardboard wrapped in plastic but it seemed to slip. I even stole my DH yoga block but it's also small. Maybe his yoga mat....:-P Frances, if you find some roofing material near you, can you drop it off at my Aunt's house in Conyers? I'm sure I can get her to mail it to me in trade for a nuno scarf. I'm afraid to go back to Goodwill. I went last weekend and came home with TONS of silk garments to deconstruct!
Surrounded by fiber & cat fur in Oak Cliff, TX, a cool & funky neighborhood in Dallas, TX!
I like floor underlay it is thick enough to feel and lasts along time. I used to use the heavy cardboard the put between layers when thins are stacked on a skid for shipping. They lasted really well. I just let it dry between. sometimes they would spit into 3 layers and then I would use all 3. Yhey are not good if you have to pull your resist out through a small opening though.